title: Enhancement of outcoupling efficiency of organic light-emitting diodes using a planarized moth-eye structure on glass substrate.
abstract: To improve optical properties of organic light-emitting diodes (OLEDs), we developed a planarized moth-eye structure by ultraviolet nanoimprint lithography (UV-NIL). The moth-eye pattern was fabricated on a glass substrate by UV-NIL using AMONIL polymer resin. It contains nanoscaled, cone-shaped, periodic pattern arrays with a 250 nm diameter and a 550 nm pitch. The glass substrate with the moth-eye structure exhibited a 1%-2% improvement in transmittance of visible wavelengths, but it requires a planarized layer with high-refractive-index materials. Photosensitive titanium precursor resin annealed by UV was used to improve the current efficiency by up to 26% versus conventional OLEDs.
authors.forename: Jeong Ho
authors.initials: JH
authors.lastname: Kim
authors.forename: Lee-Mi
authors.initials: LM
authors.lastname: Do
authors.forename: Je-Hong
authors.initials: JH
authors.lastname: Choi
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Park
authors.forename: Heon
authors.initials: H
authors.lastname: Lee